The atmosphere in a tank is too lean if it...

The atmosphere in a tank is too lean if it...

Question 1 of 2707066636eec28f7522a1c51c001

The atmosphere in a tank is too lean if it is __________.

Question 1 of 27070

Q

The atmosphere in a tank is too lean if it is __________.

🔍 Key Concepts

• Lower Flammable Limit (LFL) and Upper Flammable Limit (UFL) definitions • Relationship between fuel concentration and ability to support combustion • What is meant by an atmosphere being too lean or too rich

💭 Think About

• Think about what happens when there is not enough hydrocarbon vapor in the air mixture: can a flame travel through that mixture? • Compare what “too lean” means in terms of fuel-to-air ratio with “above the UFL” and “below the LFL”. Which side has insufficient fuel? • Focus on which option clearly states that the mixture cannot burn because of the concentration of hydrocarbon, and ties that directly to LFL or UFL.

✅ Before You Answer

• Verify the correct definitions of LFL (Lower Flammable Limit) and UFL (Upper Flammable Limit) for hydrocarbon vapors • Check which choice describes an atmosphere that is incapable of supporting combustion due specifically to fuel concentration, not just general safety language • Eliminate any answer that says the mixture is capable of supporting combustion, since “too lean” means not enough fuel to burn